Schmalleningken (in Lithuanian Smalininkai) was a village consisting of three parts on the Prussian-Lithuanian border until 1795. It served as a customs office for the Kingdom of Prussia in the 18th century, and was an important cross-border transit point for both water and land traffic. At the Third Partition of the Polish-Lithuanian Commonwealth, the lands to the east of the village on the right bank of the River Nemunas were taken over by Russia, while those on the left bank became part of Prussia, which established the province of New East Prussia there. The Congress of Vienna restored the previous configuration of the border, with the only difference being that Lithuania’s place as Prussia’s neighbour was taken over by the Russian Empire, part of which on the left bank was the Kingdom of Poland. This article examines the various institutions and actors that operated in this border area, located at the intersection of three political entities, during both this transitional period and the subsequent years leading up to the Crimean War. The aim is to show what kind of contacts took place there, what forms they took, and what changes the microcosm of Schmalleningken underwent in the early 19th century. The article explores who contributed to this, and what significance the town of Jurbarkas, located on the other side of the border, had in this contact zone. It shows the role of the Christian and Jewish populations, with their somewhat different goals. Although their cultural practices differed, their interaction was based on a common understanding of the role of a nexus on the border. This role was primarily to provide services for cross-border traffic by land and on the River Nemunas, and to promote cross-border trade.